// jquery.tweet.js - See http://tweet.seaofclouds.com/ or https://github.com/seaofclouds/tweet for more info
// Copyright (c) 2008-2011 Todd Matthews & Steve Purcell
(function (factory) {
	if (typeof define === 'function' && define.amd)
		define(['jquery'], factory); // AMD support for RequireJS etc.
	else
		factory(jQuery);
}
	(function ($) {
		$.fn.tweet = function (o) {
			var s = $.extend({
					username : null, // [string or array] required unless using the 'query' option; one or more twitter screen names (use 'list' option for multiple names, where possible)
					list : null, // [string]   optional name of list belonging to username
					favorites : false, // [boolean]  display the user's favorites instead of his tweets
					query : null, // [string]   optional search query (see also: http://search.twitter.com/operators)
					avatar_size : null, // [integer]  height and width of avatar if displayed (48px max)
					count : 3, // [integer]  how many tweets to display?
					fetch : null, // [integer]  how many tweets to fetch via the API (set this higher than 'count' if using the 'filter' option)
					page : 1, // [integer]  which page of results to fetch (if count != fetch, you'll get unexpected results)
					retweets : true, // [boolean]  whether to fetch (official) retweets (not supported in all display modes)
					intro_text : null, // [string]   do you want text BEFORE your your tweets?
					outro_text : null, // [string]   do you want text AFTER your tweets?
					join_text : null, // [string]   optional text in between date and tweet, try setting to "auto"
					auto_join_text_default : "i said,", // [string]   auto text for non verb: "i said" bullocks
					auto_join_text_ed : "i", // [string]   auto text for past tense: "i" surfed
					auto_join_text_ing : "i am", // [string]   auto tense for present tense: "i was" surfing
					auto_join_text_reply : "i replied to", // [string]   auto tense for replies: "i replied to" @someone "with"
					auto_join_text_url : "i was looking at", // [string]   auto tense for urls: "i was looking at" http:...
					loading_text : null, // [string]   optional loading text, displayed while tweets load
					refresh_interval : null, // [integer]  optional number of seconds after which to reload tweets
					twitter_url : "twitter.com", // [string]   custom twitter url, if any (apigee, etc.)
					twitter_api_url : "api.twitter.com", // [string]   custom twitter api url, if any (apigee, etc.)
					twitter_search_url : "search.twitter.com", // [string]   custom twitter search url, if any (apigee, etc.)
					template : "{text}", // [string or function] template used to construct each tweet <li> - see code for available vars
					comparator : function (tweet1, tweet2) { // [function] comparator used to sort tweets (see Array.sort)
						return tweet2["tweet_time"] - tweet1["tweet_time"];
					},
					filter : function (tweet) { // [function] whether or not to include a particular tweet (be sure to also set 'fetch')
						return true;
					}
					// You can attach callbacks to the following events using jQuery's standard .bind() mechanism:
					//   "loaded" -- triggered when tweets have been fetched and rendered
				}, o);
			
			// See http://daringfireball.net/2010/07/improved_regex_for_matching_urls
			var url_regexp = /\b((?:[a-z][\w-]+:(?:\/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}\/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'".,<>?«»“”‘’]))/gi;
			
			// Expand values inside simple string templates with {placeholders}
			function t(template, info) {
				if (typeof template === "string") {
					var result = template;
					for (var key in info) {
						var val = info[key];
						result = result.replace(new RegExp('{' + key + '}', 'g'), val === null ? '' : val);
					}
					return result;
				} else
					return template(info);
			}
			// Export the t function for use when passing a function as the 'template' option
			$.extend({
				tweet : {
					t : t
				}
			});
			
			function replacer(regex, replacement) {
				return function () {
					var returning = [];
					this.each(function () {
						returning.push(this.replace(regex, replacement));
					});
					return $(returning);
				};
			}
			
			function escapeHTML(s) {
				return s.replace(/</g, "&lt;").replace(/>/g, "^&gt;");
			}
			
			$.fn.extend({
				linkUser : replacer(/(^|[\W])@(\w+)/gi, "$1<span class=\"at\">@</span><a href=\"http://" + s.twitter_url + "/$2\">$2</a>"),
				// Support various latin1 (\u00**) and arabic (\u06**) alphanumeric chars
				linkHash : replacer(/(?:^| )[\#]+([\w\u00c0-\u00d6\u00d8-\u00f6\u00f8-\u00ff\u0600-\u06ff]+)/gi,
					' <a href="http://' + s.twitter_search_url + '/search?q=&tag=$1&lang=all' + ((s.username && s.username.length == 1 && !s.list) ? '&from=' + s.username.join("%2BOR%2B") : '') + '" class="tweet_hashtag">#$1</a>'),
				makeHeart : replacer(/(&lt;)+[3]/gi, "<tt class='heart'>&#x2665;</tt>")
			});
			
			function linkURLs(text, entities) {
				return text.replace(url_regexp, function (match) {
					var url = (/^[a-z]+:/i).test(match) ? match : "http://" + match;
					var text = match;
					for (var i = 0; i < entities.length; ++i) {
						var entity = entities[i];
						if (entity.url == url && entity.expanded_url) {
							url = entity.expanded_url;
							text = entity.display_url;
							break;
						}
					}
					return "<a href=\"" + escapeHTML(url) + "\">" + escapeHTML(text) + "</a>";
				});
			}
			
			function parse_date(date_str) {
				// The non-search twitter APIs return inconsistently-formatted dates, which Date.parse
				// cannot handle in IE. We therefore perform the following transformation:
				// "Wed Apr 29 08:53:31 +0000 2009" => "Wed, Apr 29 2009 08:53:31 +0000"
				return Date.parse(date_str.replace(/^([a-z]{3})( [a-z]{3} \d\d?)(.*)( \d{4})$/i, '$1,$2$4$3'));
			}
			
			function relative_time(date) {
				var relative_to = (arguments.length > 1) ? arguments[1] : new Date();
				var delta = parseInt((relative_to.getTime() - date) / 1000, 10);
				var r = '';
				if (delta < 1) {
					r = 'just now';
				} else if (delta < 60) {
					r = delta + ' seconds ago';
				} else if (delta < 120) {
					r = 'about a minute ago';
				} else if (delta < (45 * 60)) {
					r = 'about ' + (parseInt(delta / 60, 10)).toString() + ' minutes ago';
				} else if (delta < (2 * 60 * 60)) {
					r = 'about an hour ago';
				} else if (delta < (24 * 60 * 60)) {
					r = 'about ' + (parseInt(delta / 3600, 10)).toString() + ' hours ago';
				} else if (delta < (48 * 60 * 60)) {
					r = 'about a day ago';
				} else {
					r = 'about ' + (parseInt(delta / 86400, 10)).toString() + ' days ago';
				}
				return r;
			}
			
			function build_auto_join_text(text) {
				if (text.match(/^(@([A-Za-z0-9-_]+)) .*/i)) {
					return s.auto_join_text_reply;
				} else if (text.match(url_regexp)) {
					return s.auto_join_text_url;
				} else if (text.match(/^((\w+ed)|just) .*/im)) {
					return s.auto_join_text_ed;
				} else if (text.match(/^(\w*ing) .*/i)) {
					return s.auto_join_text_ing;
				} else {
					return s.auto_join_text_default;
				}
			}
			
			function build_api_url() {
				var proto = ('https:' == document.location.protocol ? 'https:' : 'http:');
				var count = (s.fetch === null) ? s.count : s.fetch;
				var common_params = '&include_entities=1&callback=?';
				if (s.list) {
					return proto + "//" + s.twitter_api_url + "/1/" + s.username[0] + "/lists/" + s.list + "/statuses.json?page=" + s.page + "&per_page=" + count + common_params;
				} else if (s.favorites) {
					return proto + "//" + s.twitter_api_url + "/favorites/" + s.username[0] + ".json?page=" + s.page + "&count=" + count + common_params;
				} else if (s.query === null && s.username.length == 1) {
					return proto + '//' + s.twitter_api_url + '/1/statuses/user_timeline.json?screen_name=' + s.username[0] + '&count=' + count + (s.retweets ? '&include_rts=1' : '') + '&page=' + s.page + common_params;
				} else {
					var query = (s.query || 'from:' + s.username.join(' OR from:'));
					return proto + '//' + s.twitter_search_url + '/search.json?&q=' + encodeURIComponent(query) + '&rpp=' + count + '&page=' + s.page + common_params;
				}
			}
			
			function extract_avatar_url(item, secure) {
				if (secure) {
					return ('user' in item) ?
					item.user.profile_image_url_https :
					extract_avatar_url(item, false).
					replace(/^http:\/\/[a-z0-9]{1,3}\.twimg\.com\//, "https://s3.amazonaws.com/twitter_production/");
				} else {
					return item.profile_image_url || item.user.profile_image_url;
				}
			}
			
			// Convert twitter API objects into data available for
			// constructing each tweet <li> using a template
			function extract_template_data(item) {
				var o = {};
				o.item = item;
				o.source = item.source;
				o.screen_name = item.from_user || item.user.screen_name;
				o.avatar_size = s.avatar_size;
				o.avatar_url = extract_avatar_url(item, (document.location.protocol === 'https:'));
				o.retweet = typeof(item.retweeted_status) != 'undefined';
				o.tweet_time = parse_date(item.created_at);
				o.join_text = s.join_text == "auto" ? build_auto_join_text(item.text) : s.join_text;
				o.tweet_id = item.id_str;
				o.twitter_base = "http://" + s.twitter_url + "/";
				o.user_url = o.twitter_base + o.screen_name;
				o.tweet_url = o.user_url + "/status/" + o.tweet_id;
				o.reply_url = o.twitter_base + "intent/tweet?in_reply_to=" + o.tweet_id;
				o.retweet_url = o.twitter_base + "intent/retweet?tweet_id=" + o.tweet_id;
				o.favorite_url = o.twitter_base + "intent/favorite?tweet_id=" + o.tweet_id;
				o.retweeted_screen_name = o.retweet && item.retweeted_status.user.screen_name;
				o.tweet_relative_time = relative_time(o.tweet_time);
				o.entities = item.entities ? (item.entities.urls || []).concat(item.entities.media || []) : [];
				o.tweet_raw_text = o.retweet ? ('RT @' + o.retweeted_screen_name + ' ' + item.retweeted_status.text) : item.text; // avoid '...' in long retweets
				o.tweet_text = $([linkURLs(o.tweet_raw_text, o.entities)]).linkUser().linkHash()[0];
				o.tweet_text_fancy = $([o.tweet_text]).makeHeart()[0];
				
				// Default spans, and pre-formatted blocks for common layouts
				o.user = t('<a class="tweet_user" href="{user_url}">{screen_name}</a>', o);
				o.join = s.join_text ? t(' <span class="tweet_join">{join_text}</span> ', o) : ' ';
				o.avatar = o.avatar_size ?
					t('<a class="tweet_avatar" href="{user_url}"><img src="{avatar_url}" height="{avatar_size}" width="{avatar_size}" alt="{screen_name}\'s avatar" title="{screen_name}\'s avatar" border="0"/></a>', o) : '';
				o.time = t('<span class="tweet_time"><a href="{tweet_url}" title="view tweet on twitter">{tweet_relative_time}</a></span>', o);
				o.text = t('<span class="tweet_text">{tweet_text_fancy}</span>', o);
				o.reply_action = t('<a class="tweet_action tweet_reply" href="{reply_url}">reply</a>', o);
				o.retweet_action = t('<a class="tweet_action tweet_retweet" href="{retweet_url}">retweet</a>', o);
				o.favorite_action = t('<a class="tweet_action tweet_favorite" href="{favorite_url}">favorite</a>', o);
				return o;
			}
			
			return this.each(function (i, widget) {
				var list = $('<ul class="tweet_list">');
				var intro = '<p class="tweet_intro">' + s.intro_text + '</p>';
				var outro = '<p class="tweet_outro">' + s.outro_text + '</p>';
				var loading = $('<p class="loading">' + s.loading_text + '</p>');
				
				if (s.username && typeof(s.username) == "string") {
					s.username = [s.username];
				}
				
				$(widget).unbind("tweet:load").bind("tweet:load", function () {
					if (s.loading_text)
						$(widget).empty().append(loading);
					$.getJSON(build_api_url(), function (data) {
						$(widget).empty().append(list);
						if (s.intro_text)
							list.before(intro);
						list.empty();
						
						var tweets = $.map(data.results || data, extract_template_data);
						tweets = $.grep(tweets, s.filter).sort(s.comparator).slice(0, s.count);
						list.append($.map(tweets, function (o) {
								return "<li>" + t(s.template, o) + "</li>";
							}).join('')).
						children('li:first').addClass('tweet_first').end().
						children('li:odd').addClass('tweet_even').end().
						children('li:even').addClass('tweet_odd');
						
						if (s.outro_text)
							list.after(outro);
						$(widget).trigger("loaded").trigger((tweets.length === 0 ? "empty" : "full"));
						if (s.refresh_interval) {
							window.setTimeout(function () {
								$(widget).trigger("tweet:load");
							}, 1000 * s.refresh_interval);
						}
					});
				}).trigger("tweet:load");
			});
		};
	}));
